I have been a believer that the engineers who design these things need to spend time working with the service technicians in the repair shop to experience first hand how their designs can be a royal pain in the backside to fix.
Ex. My brother has JD lawn mower. The main drive belt was frayed and needed to be changed. The JD belt costs $25.00. In order to change the belt you have remove the seat, hydrostatic foot controls, floor board and cowl, disconnect the fuel line from the gas tank, remove the gas tank, disassemble the rear steering linkage (this mower is all wheel steering) and remove the cooling fan on top of the transmission. Once that's done, you need to get it in the air to release the tension on the tensioner pulley. Only then can you fight to remove old belt and replace it with the new. Then you get to experience the joys of reassembly. This job should only take 1 hour, tops, but takes at least 2 and 1/2 to 3 hours from start to finish. Thankfully I have the tools and time to do the job myself. I feel for the people who do not have the time or mechanical aptitude to do it themselves. Roger